1276. Blood, Professor Solly observes, 'consists of water holding in solution albumen, fibrin, a peculiar red colouring matter, fat, and various inorganic substances, including chlorides of sodium and potassium, carbonates, sulphates, and phosphates of potash, soda, lime, and magnesia, and also a portion of iron.' (Solly's Rural Chemistry, 2nd ed., p. 124.) Blood is a very powerful manure on account of the numerous saline and earthy matters which it contains. The scum taken from the boilers of the sugar-bakers, which is used as manure, principally consists of bullocks' blood, which has been employed for the purpose of separating the impurities of common brown sugar, by means of the coagulation of its albuminous matter by the heat of the boiler.